A tidal flat is an extensive, nearly horizontal, marshy or barren tract of land that is alternately covered and uncovered by the tide, and consisting of unconsolidated sediment (mostly mud and sand).

• 潮滩是一片广阔的、几近水平的、沼泽般或贫瘠的土地。它被潮汐时或覆盖，由疏松的沉积物所构成（主要是泥和砂），可以形成三角洲沉积平原的顶端地面。